# Proposed AD FAA-2004-18850: Eurocopter France Model AS-365N2, AS 365 N3, EC 155B, EC155B1, SA-365N, N1, and SA-366G1 Helicopters

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2004-16-15
- Products: Eurocopter France
- Product type: Aircraft
- Action: Notice of proposed rulemaking (NPRM).
- Published: May 2, 2006, 71 FR 25789
- Comments due: July 3, 2006
- Became: [AD 2004-16-15](https://openairdocs.org/ad/2004-16-15)
- Docket: FAA-2004-18850 (https://www.regulations.gov/docket/FAA-2004-18850, where comments are filed)
- Project: 2004-SW-19-AD
- FR document: 06-4107
- Official PDF: https://openairdocs.org/files/sha256/b7/df/b7df8684c80bc16955fc787affa04b1d7434bfe678c486a4bf942e5d2a8f8548 (from https://www.govinfo.gov/content/pkg/FR-2006-05-02/pdf/06-4107.pdf)
- Federal Register: https://www.federalregister.gov/documents/2006/05/02/06-4107/airworthiness-directives-eurocopter-france-model-as-365n2-as-365-n3-ec-155b-ec155b1-sa-365n-n1-and
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/93CA226CA5484F5986257162005848B7.0001
- Page: https://openairdocs.org/proposed/FAA-2004-18850

## Summary

This document proposes to revise an existing airworthiness directive (AD) for Eurocopter France (Eurocopter) Model AS-365N2, AS 365 N3, EC 155B, EC155B1, SA-365N, N1, and SA-366G1 helicopters. That AD currently requires inspecting the main gearbox (MGB) base plate for a crack and replacing the MGB if a crack is found. This action would increase the time intervals for inspecting the MGB base plate. This action would also include minor editorial changes throughout the AD. This proposal is prompted by crack growth tests that indicate that the inspection intervals can be increased without affecting safety. The actions specified by the proposed AD are intended to detect a crack in an MGB base plate and prevent failure of one of the MGB attachment points to the frame, which could result in severe vibration and subsequent loss of control of the helicopter.

## Notices in this docket

- May 2, 2006: Notice of proposed rulemaking (NPRM). (first notice), FR document 06-4107, comments due Jul 3, 2006 (https://www.federalregister.gov/documents/2006/05/02/06-4107/airworthiness-directives-eurocopter-france-model-as-365n2-as-365-n3-ec-155b-ec155b1-sa-365n-n1-and)

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